A collection of simple online developer utilities for formatting, decoding, generating, and calculating data. Browse the tools below and open any one to start using it.
Format and validate JSON input quickly for APIs and web development.
Decode JWT headers and payloads to inspect authentication tokens.
Encode text to Base64 or decode Base64 content back to plain text.
Create version 4 UUIDs for databases, APIs, and system identifiers.
Generate MD5 and SHA-256 hashes for text and strings.
Format and minify JSON responses from APIs for easy debugging.
Test regular expressions against sample text and inspect matches.
Build cron schedules for automation and server tasks.
Create simple invoice previews for services and freelance work.
Calculate tax amounts and totals with a chosen tax rate.
Calculate profit and margin percentage from cost and selling price.
Estimate salary, deductions, and take-home pay for payroll planning.
Convert between major currencies for travel, budgeting, and estimates.
Estimate monthly installments, total interest, and total repayment for a loan.
Generate creative business name ideas for startups and brands.
Create QR codes for URLs, text, and simple messages.
Create SEO-friendly title, description, and keyword tags.
Generate social share previews and OG meta tags.
Create robots.txt rules to guide crawler access.
Create XML sitemaps from a list of URLs.
Check how often a keyword appears in your content.
Generate clean, SEO-friendly URL slugs from any title.
Create campaign URLs with UTM parameters for tracking.
Create a professional email signature with your contact details.
Create relevant hashtags for social media posts and campaigns.
Create polished bios for profiles, portfolios, and introductions.
Create catchy title ideas for videos, tutorials, and channel content.